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Figure 18. Successful PING Messages
3. If the PING operation is successful, you should see messages similar to those in
Figure 18.
If the PING operation is unsuccessful, you should see messages similar to those
in Figure 19.
If you receive an unsuccessful PING message, check your configuration steps.
Also check that the configuration at the remote system is correct and that the
remote system is not powered down. For additional information about
identifying the cause for an unsuccessful connection verification, see TCP/IP
Troubleshooting
(http://publib.boulder.ibm.com/pubs/html/as400/v5r1/ic2924/info/rzaku/
rzakuoverview.htm) in the Information Center. If you are using the
Supplemental Manuals CD, then switch to the iSeries Information Center CD to
access this information.
Figure 19. Unsuccessful PING Messages
Note: A datagram sent by TCP or UDP to a system with the name LOOPBACK
does not actually leave the system. The IP layer, instead, returns the
datagram to the TCP or UDP layer from which it came. The other layers
then treat the datagram as a normal incoming datagram. The LOOPBACK
host name can be used with any TCP/IP command requiring a system
name, such as PING or FTP (or any TCP or UDP application including
user-written applications). Using the LOOPBACK default host name
provides an ability to test TCP/IP applications without actually connecting
to a physical network.
The server defines LOOPBACK as the default host name by automatically creating
an entry in the local host table.
Verifying Additional TCP/IP Connections
Once TCP/IP is configured on the iSeries, and the initial connection is verified,
you will probably want to add more systems to your network. When you connect
Chapter 1. Configuring TCP/IP
27
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